Question

Solve the following question​

Answer 1

Considering that a fraction is not defined when the denominator is zero, the equation is not defined for an angle of 90º.

When is a fraction not defined?

A fraction is not defined when the denominator is zero.

In this problem, the expression is given by:

cos(θ)/(1 - sin(θ)) + cos(θ)/(1 + sin(θ)) = 4.

The denominators are zero in two cases:

• 1 - sin(θ) = 0 -> sin(θ) = 1 -> θ = 90º.

• 1 + sin(θ) = 0 -> sin(θ) = -1 -> θ = 270º.

Hence the equation is not defined for an angle of 90º.

More can be learned about not defined fractions at brainly.com/question/16948935

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